<template>
    <div class="app-container">
        <el-form label-width="120px">
            <el-form-item label="信息描述">
                <el-tag type="info">excel模板说明</el-tag>
                <el-tag>
                    <i class="el-icon-download"></i>
                    <a :href="'https://mju-sdy.oss-cn-hangzhou.aliyuncs.com/defaultExcel/file.xls'">点击下载模板文件</a>
                </el-tag>
            </el-form-item>

            <el-form-item label="选择Excel">
                <el-upload
                    :on-success="uploadSuccess"
                    :on-error="uploadError"
                    :disables="importBtnDisabled"
                    :limit="1"
                    :action="BASE_API+'/eduservice/course-type/addCourseType'"
                    name="file"
                    class="upload-demo"
                    ref="upload" 
                    accept="application/vnd.ms-excel"
                    :auto-upload="false">
                    <el-button slot="trigger" size="small" type="primary">选取文件</el-button>
                    <el-button 
                        :loading="loading"
                        style="margin-left: 10px;" 
                        size="small" 
                        type="success" 
                        @click="submitUpload">{{fileUploadBtnText}}</el-button>
                </el-upload>
            </el-form-item>
        </el-form>

        
    </div>

</template>

<script>
export default {
    data(){
        return{
            BASE_API:process.env.BASE_API,//接口API地址
            OSS_PATH:process.env.OSS_PATH,//阿里云OSS地址
            fileUploadBtnText:'上传到服务器',//按钮文本
            importBtnDisabled:false,//按钮是否禁用
            loading:false
        }
    },
    created(){

    },
    methods:{
        //上传成功
        uploadSuccess(response){
            this.fileUploadBtnText = '上传成功'
            //提示成功
            this.loading = false
            this.$message({
                type: 'success',
                message: '添加课程分类成功!'
            });

            //路由跳转
            this.$router.push({path:'/course/list'})
        },
        //上传失败
        uploadError(response){
            //提示失败
            this.loading = false
            this.$message({
                    type: 'error',
                    message: '添加课程分类失败!'
            });
        },
        //上传文件到接口
        submitUpload(){
            this.fileUploadBtnText = '正在上传'
            this.importBtnDisabled = true
            this.loading = true
            //等同于：document.getElementById("upload").submit()
            this.$refs.upload.submit()

        }
    }
}
</script>